Clamping spring, connecting assembly and connecting terminal

The invention relates to a clamping spring (100) for clamping a conductor (400) to be connected relative to a current bar (210), comprising: a holding leg (110); a clamping leg (111) which can be transferred to an open position and a clamping position; the invention relates to a locking device (100) for a motor vehicle, comprising an actuating element (211), and a locking leg (112) which can be transferred into a holding position, in which the locking leg (112) is held on the actuating element (211) and in which the locking leg (112) is released from the actuating element (211), and a release position, in which the locking leg (112) has a pressure surface (117), in which the locking leg (112) is pressed against the actuating element (211). The clamping leg (111) has a pressure surface (117), by means of which the clamping leg (112) can be transferred from a holding position to a release position by means of the conductor (400) to be connected, the pressure surface (117) having a section (123) which is curved